The hottest gold and silver vermicelli screen prin

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Gold and silver vermicelli printing ink

printing materials printed with gold and silver powder ink are very popular with consumers, but there are a series of problems in the production, storage and use of these inks. This is a great challenge for silk printers. Before using metal powder ink, we need to know what is the difference between gold silver powder ink and traditional ink. First, we need to look at the composition of the printing ink of gold and silver vermicelli, what special needs it brings to the printing process, and understand the applications in which this ink is applicable and what is not applicable

what is gold and silver powder ink

the main components of gold and silver vermicelli printing ink are: metal powder raw materials and liquid resin (i.e. ink binder). Ink binder acts as the binder of pigments and protects the ink film after drying

the metal powders used in gold ink and silver ink are easily oxidized copper and aluminum powders, which will lose their metallic luster under the action of moisture, atmosphere, heat and some chemicals. For example, copper powder is easy to blacken when the binder is acidic or in the presence of trace sulfur. After printing, it will slowly lose luster and blacken when interacting with sulfur in the atmosphere

its storage performance and printing performance are not good. Do not reuse the used ink. There is a certain proportion of zinc powder in the copper powder used in the gold ink. According to the different proportions, the gold color is reddish or fluorescent, and it can also be made of aluminum powder and transparent yellow ink. Its gloss is not as good as that of the gold ink made of copper powder, but its gloss remains unchanged for a long time, and its chemical resistance and toxicity are also better

in the gold ink that looks golden, the pigment is made of a mixture of copper and zinc in different proportions. If the proportion of zinc is large (about 70% copper, 30% zinc), the gold color of the ink will appear light green, which is called richgold; If the proportion of copper is larger (90% copper, 10% zinc), the ink will appear light red, which is usually called palegold. The above proportion is two limits, between which you can get a color between the above two tones. These tones are slightly dyed with transparent orange colorant, and the colors that match the specified colors in the ordinary color matching system (such as Pantone color scale) can be obtained

silver ink is made of aluminum powder dispersed in petroleum solvent and then mixed with binder. There are two kinds of silver ink: one is that aluminum powder floats on the surface of the ink film, and its irregular reflection of light can produce the effect of silver glittering; Second, it is dispersed in the wear-resistant binder that connects to identify the ink layer (or coating), and the appearance is silver white metal

the binders of gold ink and silver ink generally use resins with extremely low acid value and amine value to avoid affecting the gloss of the ink, such as ethyl cellulose, nitrate fiber, polyvinyl acetate, polyamide resin, and add some waxes to improve the suspension of the pigment. Gold ink and silver ink can also be prepared with solvent, but they are often ready for use because of their low viscosity. The polarity of the solvent does not need to be too large, otherwise the pigment is too wet and easy to precipitate. Xylene and isopropyl alcohol can be used as solvents for gold ink and silver ink. Among them, gloss paste is used to improve the gloss of ink, and dibutyl

is used to increase the fluidity of ink. The addition of dibutyl and No. 0 inking oil has an impact on the drying performance of ink. Adding some drying oil can make the ink dry quickly. Pearlescent color is made by dispersing pearlescent pigment (or aluminum powder) in binder or transparent light colored ink. The original color of the ink film and the multiple reflections produced by the color rendering of the metal powder form a pearl like luster effect, so it is called pearl luster

the size of metal pigment particles and other small parts such as control arm and steering knuckle depend on its final use. For silk printing, which is used to compress wool, textile raw materials and oil extraction, the pigment particle size is usually between 3~15 M. The specific requirements for pigment particle size in silk printing depend on the end use of the printed matter

the larger the particle size, the better the reflection performance of the ink film after printing, and the higher the gloss. Because when the pigment particles are larger, the surface of the pigment particles is larger, and more light will be reflected through it, so the gloss is higher. However, the pigment with too large particles will bring difficulties to the efficient transfer of ink in the printing process, because it requires a larger purpose. Fine metallic pigment particles are easier to transfer, unlike those oversized particles that need to increase the target screen, but fine pigment particles sacrifice gloss

therefore, it is ideal that coarse pigment particles can be applied to low-grade printing materials, such as T-shirts; For high-end printing materials such as CDs, the smallest pigment particles are the most ideal

but in reality, gold and silver powder inks containing pigments that just reach the ideal size do not exist. Inks usually contain a mixture of pigment particles, most of which are within the target range. Although the level of pigment crushing processing technology has been improved, and the ability to separate particles according to size has also been improved, there is little difference between inks produced with coarse and fine pigment particles in printing. This indicates that during the printing process, there are some pigment particles that cannot pass through the eyes and still stay on the plate surface

the size of pigment particles is too fine, which will sacrifice some gloss. However, the greater benefit is that it can obtain a fairly good surface coverage (for pigments of the same weight, fine particles have a wider distribution area than coarse particles). The challenge for silk printing manufacturers is to produce inks with pigments that are as fine as possible to achieve high coverage, good gloss, and close distribution

proportion of gold silver powder ink

metal pigment particles are usually coated with a layer of fatty acid during processing. During the printing process, this acid can help the pigment particles suspend on the surface of the ink film. At the same time, the pigment particles are distributed in thin sheets, so as to obtain a smooth surface with reflective ability to light. Such an ink film is called a layered ink film

because the pigment is on the surface of the ink film, it is easy to fall off and wear. This problem is more obvious on the coarser pigment particles. If the size is smaller, the exposed surface area will be smaller, and it will be more firm. To solve this problem, only non layered gold silver ink can be used. At this time, the pigment particles will precipitate to the bottom of the ink film, greatly improving their adhesion. However, because the particles are not arranged in a regular line at the bottom, the light must pass through the binder and enter the bottom, so that it can be reflected by the particle surface, sacrificing the gloss. Non layered gold silver ink is particularly widely used in silver powder ink, and Guo Xiantong is used in gold powder ink/P

printers will ask whether this kind of ink can be used outdoors. In some cases, it is possible. If the gold and silver pigment is specially treated, it can resist the gloss loss and oxidation defects exposed outdoors. When these pigments, which are similar to automotive coatings, are used in silk printing, the printed matter can not only resist the irradiation of ultraviolet light, but also withstand salt spray and other extreme climatic conditions. However, inks with the above particles as pigments are more expensive than inks with ordinary metal pigments, and the elongation of non-ferrous metals is much higher. It should also be noted that the ability of the treated gold pigment to resist extreme conditions is not as good as that of the treated silver pigment

the chemical characteristics of gold and silver powder pigments determine that they cannot be directly added to ink for sale as finished products. In most cases, metal powder is sold as part of silk printing ink, and binder is added when used. This is because metal pigments are easy to react and emulsify when mixed with transparent binders for a long time. Under different conditions, the shelf life of the ink is also different after the metal pigment particles are mixed with the binder, usually between several hours and months. Manufacturers of pigments and inks have been committed to solving the problem of limited ink shelf life. Now, some finished gold and silver vermicelli printing inks containing metal particles have been released, with a minimum shelf life of 6 months. It is expected that this kind of ink will become the dominant market in the next five years

use of gold and silver powder ink

when printing with gold and silver powder ink, the choice of substrate material is very critical, because there are many pores on the surface, and the permeable substrate material will absorb the transparent resin liquid. Especially when the ink viscosity is low, the resin will be absorbed, and the pigment particles will remain on the surface of the substrate material. The resin composition is small, which will cause the silver powder to appear gray, while the gold powder will appear brown. If there is no other choice but to use absorbent substrate, it is best to first print a layer of ink (like traditional transparent glazing oil) to seal the pores on the surface of the substrate, and then print gold and silver powder ink on it. A layer of varnish is printed on the metal ink film, which can resist the falling off and wear of particles in the ink. However, the more transparent varnish on the metal pigment particles, the weaker the reflection performance and gloss of the ink film

metallic pigments are prone to oxidation. Taking gold powder pigments as an example, their oxidation occurs on copper and zinc particles, resulting in the reduction of the gloss of the ink layer. In some cases, the ink will even appear light green. Aluminum pigments in silver pigments tend to turn gray and white after oxidation. Oxidation is one of the reasons why the color consistency of gold silver powder ink is difficult to achieve

Another reason why it is difficult to guarantee the color consistency is the arrangement of pigments, especially the layered gold silver powder ink. The metal sheet floats on the surface of the ink film, forming many voids (the coarser the size of the color particles, the larger the voids). After printing, the appearance of these small gaps makes the color of the substrate material or the color of the lower ink appear visually through the surface color of the metal layer. For example, silver ink on a blue background will appear light blue; If the yellow or green ink film is pre printed under the gold powder ink, the gold color of the ink will also be changed. Using non color such as white or light gray as the base color can alleviate this problem. Silver pigment usually shows a dark tone, while gold powder can not only show dark tone, light tone and various tones between them, but also be used to obtain a series of oxidation tones, which refers to the oxide reaction obtained under the allowed and controlled conditions of the pigment, and the reaction results include the tone of gold with lemon yellow or light orange red

gold powder pigments can also produce light tones such as green or purple, which are obtained by adding pigments of various colors to gold powder inks. However, these colors are more unstable. Compared with pure metal colors, they are very incongruous and easy to fade

light colored silver powders often use transparent colorants, so that they look like gold powder pigments. This method also solves the oxidation problem of gold powder. Such silver powder can be used for non layered gloss inks, but the color is not as clear as standard layered silver ink

in addition to traditional colors, most color matching systems point to a series of metal inks. Silver powder metal pigment is used as the base color, and then colored with red, yellow or orange ink. The challenge of manufacturing this kind of ink is that some pigments such as red, orange and yellow used for color matching may react with metal pigments, thereby destroying the printed text. Producers need to be extremely careful when mixing metal colors to avoid the above problems

the use of toned gold and silver powder ink increases the coverage area and enables more accurate deployment of special colors. However, some ingredients added for color matching will reduce the gloss of gold and silver pigments. When customers maximize their reflexes

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